Rivet



(No Model.) I

W. O. BRAY.

RIVET.

- No. 425,294. Patented Apr. 8, 1890.

( Witnesses .Bwenlnr:

g g v wmmcmbmlzm Marne UNITED STATES ATENT Enron.

RIVET.

SPECIFICATION forming part of Letters Patent No. 425,294, dated April 8, 1890.

' Application filedJanuary 24, 1890. Serial No. 338,0Q6. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM CLAXTON BRAY, of Newton, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement in Rivets, of which the following, taken in connection with the accompanying drawings,is a specification.

My invention relates to rivets and to that class of rivets that are made from solid wire and have slotted or divided shanks; and it consists in certain novel features of construction and conformation, which will be readily understood by reference to the description of the drawings forming a part of this specification, and to the claims hereinafter given, and in which inyinvention is clearly pointed out.

Figure l is an elevation of a rivet, illustrating one form of my invention, looking at the broad side of the prong. Fig. 2 is an elevation of the same, looking at the edges of the prongs. Fig. 3 is a transverse section through the prongs on line :10 a: on Fig. 2.

Figs. 4, 5, and 6 are corresponding views to Figs. 1, 2, and 3, but illustrating a slightlymodified form of my invention; and Figs. '7 and S are respectively a plan and elevation of a partially-formed rivet before the final operation of shaping the prongs.

Rivets have been made in a variety of forms from both sheet metal and from solid wire; but for the best work the rivets made from solid Wire are preferred, Whether having tubular or bifurcated shanks.

Great quantities of rivets are now used in various kinds of leather-work, and for this class of work those rivets are preferred which will cut their own way through the material and be readily and easily clinched, and at the same time present no sharp corners upon its clinched side to chafe or injure the object with which it may come in contact while in use. To produce a rivet having all these desirable qualities is .the object of my present invention, and in carrying out my invention I first form a solid rivet from a short sect-ion of wire of adiameter corresponding to the desired diameter of the rivet-shank under its head by forming a suitably-shaped head a on one end thereof, and then I divide the shank of said rivet into two prongs by punching out the central portion of the stock of at c 0, Figs. at, 5, and 6.

said shank by means of suitable dies or otherwise cut away said stock, so as to form an open space between the two prongs b Z), the inner faces of said prongs being preferably curved longitudinally, as shown in Fig. 8. I then subject the prongs Z) Z) to the action of suitable swaging-dies to give to the inner surfaces thereof a transverse curve, while said prongs remain of greater thickness at the center of their widths than at their longitudinal edges, as shown in Fig. 3. In some cases, where a thinner prong is preferable, when the prongs are swaged I use dies so formed as to partially flatten the outer or peripheral surfaces of said prongs, as shown The shank may be divided throughout its whole length, if desired, but I prefer to leave a short section of the shank next the head solid or undivided, as shown in the drawings. 1

Rivets made from solid Wire of the forms shown in Figs. 1 to 6, inclusive, have cutting ends rounded transversely, so that they pierce the material easily, and the prongs have sufficient stiflness due to their shape in crosssection and increased thickness near their junction to force their way through the hardest material, while at the same time their points are easily turned when they come in contact with the anvil, and when clinched they present no sharp corners on their outer surfaces.

-What I claim as new, and desire to secure by Letters Patent of the United States, is-

1. A rivet made from solid wire and having a head formed by upsetting said wire, and two prongs made thicker at the center of their widths than at their longitudinal edges, and having their inner faces convexly curved in the direction of their widths.

2. A rivet made from solid wire and provided with two prongs, the inner faces of which are convexly curved in the direction of their widths and the central portions of their outer faces are flat planes.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, on this 23d day of January, A. I). 1890.

\VILLIAM C. BRAY.

Witnesses:

N. C. LOMBARD, WALTER E. LOMBARD.

IOO 

